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Concept and Design of a Modular CNS / ATM Receiver System

A high-frequency receiver must be designed very careful and well-considered to get useful signals. Jakob Bauer designed a receiver chain that is additionally modular constructed to be used as an illustrative material in lectures as well as a generally usable flexible receiver. The design process starts with the selection of the most useful receiver structure. For this the elements for a certain application, in this case the reception of GPS-frequency at 1.5 GHz and the reception of the hydrogen line at about 1.4 GHz must be chosen. This concerns a radio frequency bandpass filter, a low-noise amplifier, mixer with a local oscillator and an intermediate frequency receiver in the use receiver chain.

 

The chosen circuit must be controlled for his efficiency and the signal quality. At first the needed microstrip width of the circuit board must be calculated. Following this a link-budget calculation takes place which adds up all gains and losses of the single elements. Additionally, the noise of the elements is considered. With those two values the signal to noise ratio can be calculated, which gives a good overview of the whole circuit and the output signal.

The second test is about the so-called S-parameters, which are very important at high frequencies. For that a simulations program is used, in which a schematic circuit with all important values around the operating point gets calculated. The output of this analysis takes place via a smith-chart.

After a successful analysis the circuit is constructed in EAGLE and gets manufactured. At the end it gets assembled and tested for its functionality.

Mechanical Conception and Construction of a Dualcopter

Klaus Graf, a team member who is currently doing his master’s degree in aviation, worked on a very interesting project in his first bachelor thesis. A dualcopter in general is an exotic type of multicopter. The realization can pursue in different ways. This project focuses on the concept of the tilt-rotor approach and contains the design, preliminary calculation methods and the manufacturing of two prototypes.

The first and smaller prototype was made to get an inside view of the in-flight-behaviour and to test early control unit designs. To fulfil the requirement of easy replacement, RotorBits® and some 3D printed parts were used. A detailed CAD model in CATIA® also provides the moment of inertia for further control unit designs and simulation purposes.

Expertise and weak points of the first prototype were analysed and taken into consideration for the development of the final prototype. The tilt mechanism was designed to be as rigid as possible, fast and precise to handle the 15” propeller and its deviation moments. Frame plates were milled out of CFRP and aluminium components were manufactured on a lathe to withstand the enormous forces.

Matlab Programming Project

During the third semester students have to fulfil a MATLAB® programming project. One of these projects was realised by Victoria and Annika together with two fellow students. It was a quadcopter failure simulation which will be used in a later task to analyse failures of individual motor shutdown or a total shutdown and visualizes graphs and animations.

The main goal of this project was to create quadcopter failure simulations on MATLAB® and Simulink®. The variables of the simulations would be saved in a multidimensional matrix, which can contain millions of simulations worth of data. This data can be read into Artificial Intelligence, which would then be able to recognise the type of failure as it is happening in real-life and combat it.

This was achieved by expanding on an already existing MATLAB® code, which simulated a quadcopter in stationary flight. The program expansion included the implementation of shutdown variables, interpolation of data, implementation of a regulator and the creation of a graphical user interface.

The GUI enabled the user to choose the desired parameters of flight. The user can choose from a list of simulation options, including the type of flight, type of failure, time of the failure, time and number of simulations, wind velocity and wind angle. The settings can also be set to random. The program then shows a simulation of the desired flight and failure of a quadcopter, and plots how the various variables are affected over time.

The system also allows the plotting of variables from multiple simulations to observe how the different failure modes lead to different plots on the same graph.

Coorperation with Drone Rescue Systems

For 1 1/2 years we have a cooperation with the company “Drone Rescue Systems” (=DRS). This partnership is a great opportunity for Team Drone Tech to expand our research duty.

Drone Rescue Systems developed the fastest and most efficient parachute safety solution for drones available on the market. This system is essential to protect expensive equipment on drones. Furthermore, in case of an accident, it also protects bystanders. During the last year we built a test drone for DRS and carried out the necessary flight test to verify the system reliability and integrity.

We are looking forward to continue our successful cooperation.


For more information about Drone Rescue Systems:

http://www.dronerescue.at